Note 7 - Commitments and Contingencies (Details Textual) - shares		12 Months Ended
Apr. 13, 2021	Jul. 31, 2023
Common Stock, Number Of Shares Retuned To The Company (in shares)		4,750,000
Calihoma Partners LLC [Member] \| West Lenapah Project [Member]
Equity Method Investment, Ownership Percentage	60.00%
Calihoma Partners LLC [Member]
Business Acquisition, Percentage of Ownership Membership Interests Transferred	100.00%
Calihoma Partners LLC [Member] \| Scenario, Plan [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	5,000,000
Calihoma Partners LLC [Member] \| Common Stock to be Issued [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	5,000,000	5,000,000
Calihoma Partners LLC [Member] \| NMEX Natural Gas LLC [Member]
Business Acquisition, Percentage of Voting Interests Acquired	35.00%

Represents the percentage of ownership membership interests transferred on a business acuisition.

No definition available.

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Namespace Prefix:	nmex_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of shares of common stock to be returned to the company.

+ References

No definition available.

+ Details

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Namespace Prefix:	nmex_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479581/805-30-50-1

+ Details

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

+ Details

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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